Question

describe two changes that are harmful explain why you consider them harmful how can you prevent them

Answer 1

Two changes that are harmful and the preventions are the following :
1. Rusting of iron: If bicycle chain is rusted, it may result in breakage of bicycle chain.
Prevention : Apply grease on it regularly.
2. Food getting spoilt : It can cause food poisoning and other stomach related diseases
Prevention : Preserve the food in the refrigerator.

Answer 2

1.Rusting Of Iron:If bicycle chain get rusted,it may result in breakage of bicycle chain.

Prevention:Apply grease on it regularly.

2.Burning Of wood:When wood is burnt,it releases harmful gas and pollutes the earth.

Prevention:Use clean fuels like CNG,LPG,et